engine swap

[garner90]

hi

if i was to do an engine change what would i have to do?

iv just bought a corsa gsi to use as a runaround but it needs a new engine, i was thinking about putin a 1.0 or a 1.2 in.

Would my insurance premium be cheaper if i did this? And how would i be able to prove to insurance/DVLA i had made the engine smaller

thanks